Voltage regulator (T455E)

This positive feedback voltage regulator was found in the 1950s MIT documentation. The circuit allows you to adjust the output voltage.

Power Zener (CB216E)
Using in operational amplifier is possible to increase the dissipation power of a zener. This...
1 kHz Tone Recognizer (CB1428E)
This circuit is found in a 1975s documentation for radio amateurs. It was developed to recognize a...
Fluorescent Rhythm Light For the Car (CB3810E)
This 1987 circuit uses a common ignition coil to generate high voltage to power a fluorescent lamp that...